Polyhedra.
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Every shape that is round does not have edges. A shape that has sharp points and has straight lines can have edges.
A pentagon
hexagon
A triangular pyramid.
Rule for PolygonThe rule/meaning for a polygon is; A shape that has to have three or more straight edges. They have to be connected. The rule for a shape to be a polygon is it has to be a shape that has three or more straight edges, none of them can overlap, and they all have to be connected.What_is_the_Rule_for_a_polygon